Alarm clock



W. MAIER.

ALARM CLOCK.

APPLICATION FILED APR-19. 1921.

Patented Mar. 21, 1922.

, UNITED STATES PATENT OFFICE. I

WILHELM MAIER, OF'SCHWENNINGEN, GERMANY.

ALARM CLOCK.

Specification of letters Patent Patented Mar. 21,1922. Application filed April 19, 1921. Serial No. 462,652.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. L., 1313.)

To all whom it may concern:

Be it known that I, WVILHEnM h/IAIER, a subject of'the German Republic, and resident of Schwenningen, Germany, have 1nvented a certain new and useful Improved Alarm Clock (for which I have filed application in Germany January 16, 191%, Patent No. 291,060,) of which the followlng is a specification.

This invention relates to an alarm-clock having a means for automatically stopping the alarm, said means consisting in a lever attached to the winding-up shaft of the clock, moved by this latter by friction, and being turned back on the alarm-mechanism being released. Said lever co-operates with an oscillating arm secured to the shaft or spindle of the bell-clapper, and is capable to lock said arm. The object of the novel arrangement and combination of parts is to make moving the said lever into its locking position dependent upon lifting the clock off its support after the alarm has commencedrits operation. Then a rod held slidably at the clock-work moves automatically into a position in which it releases a pawl which up to then had co-operated with said rod in preventing the said lever from assuming that position in which it was, or is, capable of locking the bell-clapper, as is all fully described hereinafter.

In order to make my invention more clear, I refer to the accompanying drawing, in which one form of construction of my invention is shown as an example, and in which similar letters of reference denote similar parts throughout the several views.

Figure 1 is a rear-view of the interior of the clock, and Figure 2 is side-view of some of the chief parts concerned.

The locking-arm a of the bGll-OlELPPQI' lS acted on in known manner by the arm 6 of a. double-armed lever b, 12 or, more precisely, by the bent-off upper end of said arm 7). The lever 79, b is supported by the winding-up shaft 0 upon which it is held by friction and a certain elasticity. If the alarm is released, the shaft '0 rotates in the direction of the arrow shown in Figure 1, and if the lever b, b is not retained in its position by any appropriate means. it is also turned in the direction of the arrow when the bent-off upper end of the lever-arm b will get below t e bent-ofi' end of the arm a,

as shown in Figure 2 in full lines and in Figure 1 in dotted ones. If the alarm is released, the arm'a oscillates together with the bell-clapper; if the arm a is locked by the lever-arm Z), the bell-clapper cannot touch the, bell. Locking the arm a b the lever-arm Z) is automatically effected by the alarm-work operating, the arm being then moved in the direction of the arrow, and movingthis arm in the opposite direction is effected by winding-up the alarm-work, when the bent-off upper end of the arm 7) leaves the bent-off end of the arm a, as shown in full lines in Figure 1.

Now, the means for acting upon the lever 5, 72 independent of the clock-work shaft consists in a rod (Z which is held and guided at the lower part of the clock-work frame and is surrounded by a spiral spring 7" tendpart forming a pawl which co-operates with the correspondingly or suitably shaped upper end of the rod (Z. In the position shown in Figure 1 the lever 12, b is checked by the rod (Z, wherefore the bell clapper arm a is free to oscillate.

Now, supposing, the alarm-work has commenced to operate and shall. be stopped, nothing else is necessary but to lift the clock off the table or the like upon which it stands, when the spring 7 will force the rod (Z downwards and draw the upper end of this latter away from the pawl 6 in consequence of which the lever 7) will be turned frictionally by the shaft c'in such a direction that its bent-off upper end gets below the bentoff end of the arm a whereby the bell-clapper is stopped. When winding up the alarm-work, the lever 6,6 is moved back into its former position (full-line position, Figure 1), in which the arm a is again free to swing.

Having now described my invention, what I desire to secure by a Patent of the United States is v 1. In an alarm-clock, the combination, with an oscillatory arm connected with the bell-clapper, and a vertically displaceable rod guided in the lower part of the clockwork frame, of a double-armed lever held by friction upon the alarm-work winding-up shaft and extending from said arm to said rod, and a pawl attached to the lower end of the. said rod, forthe purpose set forth.

said arm to the upper end of said rod; a pawl attached to the lower end of said lover and being adapted to cooperate with the said 10 rod; and a spring tending to force the latter downwards, substantially as described.

WILHELM MAIER. 

